Reading, writing and arithmatic. Yeah, I know, only one of those starts with an 'R' when written, and only two start with an 'R' when written, or spoken, but for as long as education has been around, this has been the acronym for those subjects - it doesn't have to make sense!
Reading, riting, rithmatic. Almost as bad as phonetics being spelt with ph instead of an f and dyslexia being such a difficult word to read especially if you have dyslexia!!!!